package com.atguigu.add;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReadWriteLock;

/**
 * @author sx
 * @date 2022-02-19 15:51
 */
public class SemaphoreTest {
    public static void main(String[] args) {
        //限制线程数量，限流！
        Semaphore semaphore = new Semaphore(3);

        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                try {
                    //获取
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName() + " 抢到车位！");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName() + " 离开车位！");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    //释放
                    semaphore.release();
                }
            }, String.valueOf(i)).start();
        }
    }
}
